Valve for vacuum-pumps



QBBTERSON. VALVE FOR VACUUM PUMPS. No. 369,879 Patented Sept. 13, 188 7.

Fig.1.

1', I WITNESSES: A INVENTOR: fiph fm.

' BY 4a V ATTORNEY,

K NiTEn p STATES ATENT Erica.

OHRlSTIAlg PETERSON, OF BALTIMORE, MARYLAND.

VALVE FOR VACUUM=PUMPS.

SPECIFICATION forming part of Letters Patent No. 369,879, dated September 13, 1887.

Application filed May 31, 1387. Serial No. 239,797. (No model,)

To aZZ whom it may concern.-

Be it known that I, CHRISTIAN PETERSON, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Valves for Vacuum-Pumps, of which the following is a specification.

This invention relates to a valve-action for vacuum-pumps.

The invention is illustrated in the drawings, in which Figure l is an end elevation of the pump. Fig. 2 is a central vertical longitudinal sec tion of the pump. Fig. 3 is a vertical crosssection through the valves at one end on the line 3 3. Fig. 4 is a horizontal section on line 4 4. Fig. 5 is a vertical'longitudinal section through the part where one valve-stem is located on the line 5 5.

The letter A designates the cylinder, Z) the piston-head, and b the piston-rod. A Waterchamber, 0, surmounts the cylinder above the valves, and a suction-pipe, a, projects upward at center of water-chamber, and itslower end joins the valve-conriecting duct h. The suction-pipe a may lead to and connect with the condenser of a steam-engine .for the'exhaustion of air and vapor, or may connect with any other thing or device where it is desired to produce a vacuum. On top of the cylinder are two horizontal valve-stems, d, which are free to slide in bearings e, bored out of the metal. Each valve'stem d has at one end a flanged head, d, and at the other end a cone-point, d. The heads and points of these two valve-stems have reversed position with respect to each other. (See Fig. 4.) The two bored-out bearings e have a seat, f, for the cone-point of the stem, and at one side of'each is the suction-inlet g, which is controlled by said valve-stem. The two seats f are connected by a duct, h, (seen in Fig. 4,) which passes laterally or at right angles from each seat. and thence extends straight be tween the two bored-out bearings e-that is, parallel with them. At each seat f is a suction-duct, 9, leading into the cylinder A. At the opposite end is a recess, 2', to receive the head (1 of the valve-stem, which is the discharge-valve. An exhaust-port, It, leads from the cylinder to this recess i, and another port,

, from the recess to the water-chamber 0.

Thus the cone-point is the suction end and the head the discharge end of each valve.

The two valves (1 act alternately, one when the piston-head 1; moves forward and the other when the piston moves back. When one valve d is open, the other valve d is closed. When the discharge-valve d at one end of cylinder is open, the suction-valve d at the other end is also sure to be open, be cause both are connected together by the stem (1.

The operation of the pump is as follows: The movement of the piston head b one way causes a suction, the course of which is from the pipe at to duct 71. through the valve (2 and suction-duct 9 into the cylinder A. Then the reverse movement of the piston-head closes the said suction-valve d and opens the discharge-valve d which is at the same end of the cylinder, and thereupon the air or vapor which has just been drawn into the cylinder will be discharged into the water-chamber O by the following course: from the cylinder A through the exhaust-port In to the recess 2', and

' thence through the port k to the said water chamber. A cap, L. closes the valve-head recess i, and has a recess, m, on its inner side. A smallspiral spring, a, fits in this recess m and bears lightly against the valve (1, and serves to keep the two valves d and (P, which are connected by a stem, (1, closed. Each valve d is accessible by a side port and cap, 0. (Shown in Fig. 4.) By removing this cap 0 the valve d may be detached from the valve stem d and taken out. A discharge-valve d and suction-valve d to act at each end of the cylinder A, and my combination thereaction at each end of the cylinder, and a duct, In testimony wheieof I affix my signature in h, connecting the seats of the two sncti0nthe presence of two witnesses. Valves, the suction-pipe a, joining the said valve-connecting duct, and. two valve-stems, CHRISTIAN PETERSON d, each of which connects the discharge-valve Witnesses:

at one end with the suction-valve at the other JOHN MORRIS,

end. J NO. T. MADDOX. 

